1) Population growth contributes a sharp decline in the wildlife.(图所反映的现象,接着用具体数字说明)As is shown by the two graphs, before 1700 there was no such thing as the extinction of wildlife in the United States. But since 1800, America experienced an explosion in population growth. By 1995, it increased by 250%. The result is the corresponding rise in the extinction of species during the years between 1800 and 1900.
2) The rapid growth of American population is directly responsible for the shrinkage of the home of many wildlife species.(主题句:野生动物的家园缩小)Obviously as great amounts of natural vegetation is removed to make room for more and more towns and cities, the less and less living space is left for wildlife.
3) More people also means more food. The main solution to hunger and famine is to increase cultivated land, which further threatens the living condition of wildlife. Moreover, every year a great number of wild animals are killed mainly as a substitute for food. Hence, the mere struggle for human survival contributes directly to the extinction of wildlife species.(主题句:捕食野生动物是另一原因)
4) Finally, rapid population growth will also increase the pollution of the environment which has affected the survival of wildlife.(主题句:第三个原因是环境污染)As population grows, so will the number of automobiles and factories. According to a survey, Americans alone add more than 140 million tons of smoke and fumes to their air each year. Besides a great amount of chemical and human waste are poured into rivers, lakes and streams. This not only directly kills different kinds of fish, but contaminates the water supply for wildlife.
5) To protect wildlife, population growth must be. controlled. Besides, everyone must be made aware of the importance of protecting wildlife and of necessity of keeping ecological balance. For without wildlife, the survival of human beings will be threatened.(提出两个建议)
闪光点:
1. 三个主题句思想清楚,分别是野生动物数量下降的三个原因,后面都有具体细节说明。
2. 词汇变化:responsible for--contributes to, wildlife--species-wild animals,
3. 词汇亮点:there was no such thing as, make room for, As population grows, so will the number, be made aware of
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